ZIP Code 66531

66531 is one of Kansas's ZIP codes, delivering to addresses in Riley, Riley County.

City: Riley
County: Riley County
State: Kansas
Prefix: 665xx

Where this code sits

66531 is part of the 665xx range, the group of codes handled by one mail processing centre. It is the only ZIP code delivering to Riley.

Riley Kansas ZIP codes →

Area codes over the same ground

Postal and telephone geography are drawn separately, so these codes cover the area 66531 delivers to without sharing its boundary.

785 Area code 785

ZIP codes nearest 66531

The ZIP codes whose reference points sit closest to 66531.
ZIP code	Distance	Delivers to
ZIP code 66449	4.8 mi	Leonardville, KS
ZIP code 66505	7.9 mi	Manhattan, KS
ZIP code 66514	10 mi	Milford, KS
ZIP code 66503	11 mi	Manhattan, KS
ZIP code 67487	12 mi	Wakefield, KS
ZIP code 66554	13 mi	Randolph, KS
ZIP code 66517	14 mi	Ogden, KS
ZIP code 66520	14 mi	Olsburg, KS

Straight-line distance between place reference points, not driving distance. Where a place has no Census Gazetteer point, its postal centroid is used instead.

Each point is the reference point for 66531, plotted from its record coordinates.

Reference points and footprint
Not an official NANPA boundary
Not a USPS delivery area

Scope ZIP code 66531. Source GeoNames US postal codes (2026-07 postal dump) and Census 2024 county Gazetteer (2024 Gazetteer). Updated 15 July 2026. A ZIP code is a set of delivery routes, not an area; the point shown is a record coordinate, not a centre.